Classification
EWA - Energy economy
136
EVA - Energy demand, energy supply - comprehensive works
24
AZZ - Firm index - general
20
EXA - Energy policy
17
EAA - Energy - reference books
15
EFA - Petroleum, natural gas
12
GWA - Raw material economy, raw material policy
11
EVB - Energy supply of Germany
5
EEA - Coal - general
3
EVN - Energy supply - future aspects
3
AEK - Official corporations - Europe
2
AFW - Subject oriented organizations
2
EBA - Energy production, energy technology
2
EPK - Nuclear energy
2
YBB - Law - general
2
ECA - Energy resources
1
EHA - Renewable energy sources
1
EIP - Photovoltaics
1
EUD - Energy consumption
1
EVP - Energy models, energy system analysis
1
UEA - Environmental policy and economy - general aspects
1
UKA - Environmental damage and energy production
1
UKH - Environment and power plants, industrial plants
1
UMV - Climatic change
1
YUC - Comprehensive statistical data
1